Funding for this research was provided by:
Tilganga Institute of Ophthalmology, Kathmandu, Nepal
Vrije University Medical Center, The Amsterdam, Neatherlands
Received: 1 December 2016
Accepted: 7 February 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: 1.The study was approved by the Institutional Review Board and Ethics Committee (IRC) of Tilganga Institute of Ophthalmology (TIO) and conducted in accordance with the Declaration of Helsinki. The reference number of ethics committee approval was 01/2013/IRC-TIO.2. Ethics, consent and permission: Informed written consent was taken from the participants before enrollment in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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